Tapping and drilling chuck.



J. A. DALTON.

TAPPING AND DBILLING CHUCK. APPLIOATION FILED 1120.23. 1909.

974,239. Patented Nov.1,1910.

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claimed.

t the tapping .or drilling tool.

" UNiTED STATES PATENT OFFICE.

JOSEPH A. DALTON, 0F PAWTUCKET, RHODE iIsLAND, ASSIGNOR 0F ONE-HALF T0 PETER J. QUINN, 0F PAWTUCKET, RHODE ISLAND.

TAPPING AND DRILLING CHUCK..

To allpwho'm it may concern:

l 3e 1t known that I, J osnrH A. DAL'roN, a c1t1zen of the United States, residing at the city of Pawtucket, in the countyof Providence and State of Rhode Is1and,'have invented certain new and useful Im rove- 4ments in Ta ping and Drilling lChuc s, of which the fo lowing is a specification. My invention relates to an improved structure in that class of tools ada ted for holding taps and drills; and the o jects in View are to provide a tool of this character` for mounting in a machine-spindle to receive a positive drive for respectively feeding and reversing the tap or drill, and said tool having a graduated stop to set for any depth of ho e to be tapped or drilled, of the novel construction, arrangement, and combination of parts, as hereinafter described and In the accompanying sheet of drawings, Figure 1 represents a vertical View, partly in section and partly in elevation, of my improved tapping or Adrilling chuck complete, and showlng the normal position o f parts -prior to the tool undergoing its tapplng operation. Fi 2 is a similar View, showing the relative positlon of 'parts after the tool i f has completed its operation of tapping.

Fig. 3 is a plan section of the tool-houslng, taken on line 3.-'3. of Fig. 1, showing block-keys mounted in said housing and the driving clutch member in engagement with the blocks of said keys. Fig. 4 is a side view of said clutch member. Fig. 5 is a plan of the working clutch member. Fig. 6 is a side view of the same. Fig. 7 is aplan ofthe holding means for the graduated stop for Fig. 8 is a plan section of the tap or drill-head, taken on line 8.-8. of Fig. l., and, Fig. 9 is a perspective view of one of the block-keys for the tool-housing.

Like reference characters indicate like parts.

a designates an inverted cup-shaped housing having at its upper portion a central stock a1 to be coupled to a machine-spindle, and said housing having its lower portion vexteriorly screw-threaded, as at a2, to' engage a threaded annular flange a? of a closure member a4.

T he housing a is provided withtwo longitudlnal grooves as' at points a, a8 in Fig. 3, extending the iull de th of the interior of Patented Nov. `1, 1910.

said housing, arrange diametrically oppo-` Y site each other, and in each groove 1s made fast a key c.

Within. the upper portion of the housing a is made fasta disk-shaped clutch member d whose sides are provided with two diametrically opposite `slots lli all, to receive' therein blocks 01,201 integra of the keys '0, c, and said clutch member has a rib extending diametrically across its bottom face, as

at d2. A second disk-shaped clutch memberIA e loosely lits the bore of the housing a ,and

has a long concentric reduced cylindrical hub e1 which passes through an opening formed inthe closure member a, and said hub is also concentrically reduced in'ldif ameter to form a shank e2 to fit within an aperture of the tap or drill-head f. An eX-. l

panding coil spring g surrounds the hub e1 and is lnterposed between its clutch parte and closure member a. I 1

On that portion of the hub e1, which pro- 'ects from the closure a4, is loosely mounted a older which acts as a support k (Fig. 7:) for the stop-bar z. This ho h is made in like halves, each half having a semi-circular portion k1 to'embrace said hub each half having a semi-circular vertical portion k2 to embrace the rounded surface of' the stop-bar t', each half of said support secured together by screws j, y' and jl, and theI latter screw to act in binding the vertical portions of said sup ort .to said bar. This stop-bar z' is provide with a scale or raduated marking which extends above the inder portion of the support h, as at l inFig. 1,

and the lower part of said bar has a'laterally'bent ortion 2 adapted to rest upon thel surface o the'work which is to be'tapped or drilled and lclose to the tap or drill.

The tap-head f is secured to the shank e2 of the clutch member'e by means of a k, and said head is provided with a lsoc et to looselyrreceivethe shank Z of the tap Z1,

which 1s held in said socket by an ordinary ieldable holdin means, as at m in Fi 1. he taphead fls lar er in diametert an the diameter of the c utch-hub e1 inl order to prevent displacement of the support h,

der or support and the action of spring g tends to keep said support always in contact with the closure member a4, in the manner shown in Fig. l. When the lateral portion 2 of the stop-bar z' contacts with the surface ofthe work, during the operation of talpping, the lead of the tap Zlcauses the wor lng-clutch e to become free of the driving-clutch al, and the tap-head f carried free from contact with the sup ort la to a point equal to the depth oFi the c utch-rib d2, in the manner shown inl Assuming the tool -is mounted in the machinespindle and it isy desired that a hole ofsay one inch in depth is to be tapped, the opera-tor first slides the stop-bar to ring its three quarter inch graduation mark above the-top of the binderportions 71.2 of the sup-v port la., after which he lifts the usual operating lever of the machine to cause the tool to revolve in the direction indicated by arrow r and at thesame time automatically carry downwardly the tap. When the tap has completed three quarters of an inch of -its tapping operation the lateral portion 2 ofthe stop-bar will then be at rest'upon the surface of the tapped-work, and the tap will continue to operate one eighth of an inch farther and equal to the depth of the fixed clutch-rib d2, in order to free the clutch members al and e. When the clutch members d and e become disengaged the screwing operation of the tap causes blocks o2, o2, integral with the keys c, c, to engage in slots e3, e? formed in the sides of the clutch e, so that when the tap has reached the fulldepth of its Working distance a compression of the spring g is had, in the manner shown -in'Fig. 2. After the threaded hole has been formed the operator reverses the motion of the tool and when Athe tap frees from the hole the actionof the sprlng g forces upwardly the working-clutch e to its normal engagement with the driving-clutch al. v

By my construction and arrangement of parts I provide a device which permits of regulating the roper distance required for tappingl or dril ing, and at the same time a device that is simple, durable, and efectiva in operation.v

WhatI claim and desire to secure by Letters-Patent, is-

l. In a tool of the class described, a housing having a stock for connection with a power driven machine spindle and said hous- 111g providedy with two diametrically opposite grooves, a closure secured on said housi and provided with an opening, a key securld in each groove and having integral -blocks projecting inthe bore of said housing, a lclutch Imember made fast at the bottom of the bore ,of said housing, a movable clutch member'provided with a series of slots to receivelfthe blocks of said keys and `having a' concentric hub projecting through the the crasse areduced shank, a coil spring surrounding the hub and interposed between the closure and the last mentioned clutch, a bar havlng .a lateral portion to come in contact with the ,opening of the closure and saidhub having clutch-hub and provided with a socket to receive the shank of a tap or drill.v

2. In' a tool ofthe class described, a closed housing having a stock for connection to a power driven spindle, a iXed driving-clutch mounted in the housing, a working-clutch having an integral hub which is reduced to form a shank land expanding spring to force the wor -ing-clutch into engagement with the driving-clutch after the tapping or drilling operation, a head secured on the shank of the clutch-hub and saidshank provided withy a socket to receive the shank of the tap or drill, means to engage the working-clutch during its operation 'of tapping o r drilling, a support mounted onA the clutchhub and having a Abinder means, a stop-bar slidably mounted in the binder of said support and said bar provided with a graduated scale, whereby said bar may be set for the depth of hole desired to be tapped or drilled.

3.' In a tool of the class described, a closed housing having a stock for connection to a power driven spindle, a driving-clutch member fixed in the housing, keys secured in the housing and having integral blocks, a work'- ing-clutch member adapted to engage the first mentioned clutch and provided with a series of slots to receive the blocks of said keys and said-second mentioned clutch having a hub projecting from the housing and having a reduced shank, a head secured on the shank of said hub and provided with a socket for the reception f of a tap or drill, a support mountedon the hub and having ya clamping portion, a bar slidable in the clampingportion of-said support and pro-- vided with graduated markings and said bar adapted to come `in contact and act as a stop upon the 'surface of the work prior to the latter being tapped or drilled, and means to cause the working-clutch to release from engagement with the blocks of said' keys 'after the tappin operation.

. .4. In atool o the class described, a closed housing having a stock for connection with `a machine-spindle which is automatically Idriven to respectively feed and reverse the motion of the tap or drill, a 'disk-shaped.

disk-shaped working-clutch having j an. integral hub projecting from said housing and ,said clutch provided with a series of slot-S formed in its sides, a tap ordrill-head seclutch lixe'dly secured in said housing, a

Cured on :t reduced portion of the hub and provided within socket to receive the tap or drill, means to lock the working-clutch by its slots with said housing during the feeding depth of the tap or drill, a slidably mounted stop-bar carried b come in contact with the wor and said bar provided with a graduated scaleto give the desired depth of hole to be tapped or drilled,

the tool to and means to force the Working-clutch into 10 engagementwith the fixed clutch after the taIIipmg or drilling operation.

n testimony whereof I aix my signature in presence of two Witnesses.

JOSEPH A. DALTON. Witnesses:

y C. T. HANNIGAN, PETER J. QUiNN. 

